Soil Nutrient Status And Fertility Suitability Of Tobacco-Growing Soil In Puer

In order to comprehensively evaluate soil fertility suitability for tobacco-growing in Pu’er city,we sampled tobacco planting soil in 7 counties in Pu’er city area as the research object,344 tobacco-growing soils were collected at different altitudes from Pu’er city.The content of soil nutrient was analyzed.Pu’er tobacco-growing soil nutrient statuses were studied by variance analysis,descriptive statistics.Using PCA to determine the weight of each soil nutrient index to comprehensively evaluate and classify tobacco-growing soil in Pu’er city.Through scientific evaluation to find out the status of tobacco-growing soil fertility,on this basis to guide precision fertilization.(1)Soil pH,soil organic matter,soil available nitrogen is medium,soil available phosphorus and soil available potassium content is low in Pu’er city.Variation level is medium in different counties,soil available phosphorus,and alkali solution nitrogen,organic matter content distribution is different.(2)The range of tobacco soil fertility evaluation index in Pu’er city is 0.32-0.87.IFI value belongs to class Ⅱ.There are 63.68%IFI in medium level,class Ⅱ and class Ⅱproportion are very few which are 12.01%and 1.21%.Variation level of IFI is low in different area Pu’er city.Jinggu get the highest score which class Ⅰ proportion is higher(19.98%)than else.Mojiang and Simao have more than 10%of class Ⅰ tobacco-growing soils.Zhenyuan,Ninger and Lancang has a small amount of class Ⅴ tobacco-growing soils.(3)The soil pH,alkali hydrolysis nitrogen,available potassium and soil chloride is in a suitable range at all altitudes in Pu’er city.According to our study,except the potassium content,the soil nutrients in tobacco growing areas at different altitudes are suitable for the normal growth of tobacco plants.